CameraIcon

SearchIcon

MyQuestionIcon

114

You visited us 114 times! Enjoying our articles? Unlock Full Access!

Photosynthesis

Out of the fo...

Question

Out of the following figures, choose the one showing the correct procedure for removing chlorophyll from the leaf in the experiment ‘light is necessary for photosynthesis’:

The correct procedure is :
(1) A
(2) B
(3) C
(4) D

Open in App

Solution

The figure in option C shows the correct figure for the experiment 'light is necessary for photosynthesis'. The correct method of destarching the leafs is by boiling the leaf in ethanol kept in a water bath. Ethanol cannot be directly heated as it is a flammable substance.

Hence, the correct answer is option 3.

Suggest Corrections

thumbs-up

0

Similar questions

Q. In an experiment to show that 'sunlight is necessary for photosynthesis', the leaf is boiled in alcohol for few minutes using a water bath. It is essential because:
(a) Alcohol is highly volatile.
(b) Steam from the water bath heats the leaf rapidly.
(c) Steam from the water dissolves the chlorophyll.
(d) Alcohol is flammable.
And give reason for the answer.

Q. The steps taken for setting up an experiment to demonstrate that ‘light is necessary for photosynthesis’, were as follows :
• A strip of black paper was clipped on the leaf of a potted plant
• The plant was kept in the sun for four hours
• The strip was removed and the leaf was placed in boiling alcohol in water bath
• The leaf was washed and tested for starch
The result was not as expected. Identify the step which had been missed out :
(1) The plant was kept in the dark for 24 hours before starting the experiment
(2) The leaf was boiled in water after placing it in boiling alcohol
(3) The leaf was sprinkled with water before placing it in black paper strip
(4) A transparent strip was used to cover the black paper strip

Q. Before testing the leaf for starch at the end of the experiment, ‘light is necessary for photosynthesis’, the experimental leaf should be boiled in:

(1) Water
(2) Alcohol
(3) KOH solution
(4) Hydrochloric acid

Q. In an experiment to test the presence of starch in a leaf, the leaf is boiled in alcohol for a few minutes using a water bath. This is an essential step in the experiment because alcohol:
(1) softens the leaf
(2) disinfects the leaf
(3) allows iodine to enter the leaf
(4) dissolves chlorophyll from leaf

Q. In the experiment to show that light is necessary for photosynthesis, the plucked leaf is boiled in ethanol and then washed with water. After this, it is tested for the presence of a carbohydrate by a chemical which is :
(1) salt solution
(2) sugar solution
(3) iodine solution
(4) starch solution

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Photosynthesis

BIOLOGY

Watch in App

explore_more_icon

Explore more

Standard X Biology

Join BYJU'S Learning Program

CrossIcon